Hey, now this last one is a huge improvement from your others mainly because you are did not hesitate in putting the line down. There are still some problems with it like the transition of the line to the ankle to the foot.
the legs are a bit short, but all in all great improvement if you don't have an anatomy book i suggest you go and check on out. So you will have more reference for placement of limbs and muscle bulges. Just keep drawing and you will get there.